Keyboard Charging from an Information Handling System

1. An information handling system comprising: a housing having first and second housing portions; a hinge having first and second axles, the first axle coupled to the first housing portion, the second axle coupled to the second housing portion, the first and second axles expanding and retracting between first and second distances between each other; a processor disposed in the housing and operable to execute instructions that process information; a memory disposed in the housing and interfaced with the processor to store the instructions and information; a display disposed over at least a portion of the housing, the display operable to present the information as visual images and having a touch detection surface operable to detect touches; an integrated power source operable to power the processor, memory and display; an embedded controller operable to manage power of the integrated power source; a peripheral keyboard separate from the housing and having plural keys to accept end user inputs, the peripheral keyboard integrating a battery and having a charging port at a side surface; and a charging extension integrated in the hinge and aligned with the charging port when the peripheral keyboard is disposed between the first and second housing portions in a closed position, the charging extension providing a battery charge through the charging port.

2. The information handling system of claim 1 further comprising: a cover disposed over the hinge axles, the cover having an extended state and a retracted state; wherein the charging extension is exposed in the cover expanded state and hidden in the cover retracted state.

3. The information handling system of claim 2 wherein: the cover has an opening aligned with the charging extension; and the charging extension comprises a spring that biases through the opening in the expanded state and is pressed into the hinge interior by the cover in the retracted state.

4. The information handling system of claim 3 further comprising instructions stored in non-transitory memory and executable by the embedded controller to apply power to the charging extension only in the cover expanded state.

5. The information handling system of claim 4 wherein the hinge moves to the expanded state in response to a force applied by closing of the housing portions over the keyboard.

6. The information handling system of claim 5 wherein the display comprises a first liquid crystal display panel disposed over the first housing portion and a second liquid crystal display panel disposed over the second housing portion.

7. The information handling system of claim 5 further comprising a magnetic detector integrated in the first housing portion and interfaced with the embedded controller; a magnet integrated in the keyboard and positioned to align with the magnetic detector when the charging extension and charging port align; wherein the embedded controller applies power to the charging extension in response to detection of the magnet by the magnetic detector.

8. The information handling system of claim 5 further comprising: a first set of plural magnets disposed at the first housing portion; and a second set of plural magnets disposed at the keyboard, the first and second sets of magnets having opposing polarities that guide the keyboard to a position having the charging extension and charging port aligned.

9. The information handling system of claim 1 further comprising first and second charging extensions disposed at opposing sides of the hinge, the first charging extension aligned with the charging port in a first orientation of the peripheral keyboard, the second charging extension aligned with the charging port in a second orientation.

10. A method for charging a peripheral keyboard, the method comprising: placing the peripheral keyboard on a display of the information handling system, the keyboard having a charging port aligned against a hinge of the information handling system, the hinge rotationally coupling separate portions of a housing of the information handling system, the peripheral keyboard separate from the housing; closing the housing of the information handling system by rotating the housing portions about the hinge to capture the keyboard between the housing portions; and in response to the closing, applying a charge from a charging contact integrated in the hinge to the charging port of the keyboard.

11. The method of claim 10 further comprising: in response to the closing, expanding the hinge from a retracted position to an extended position to accept the keyboard between the housing portions; and in response to the closing, extending the charging contact out of the hinge and against the charging port.

12. The method of claim 11 further comprising aligning the charging contact and charging port with opposing magnets disposed in the housing and keyboard that bias the keyboard to a predetermined position.

13. The method of claim 10 further comprising: integrating a magnet in the keyboard; detecting the magnet with a Hall sensor disposed in the housing; and in response to the detecting, authorizing application of power at the charging contact with an embedded controller of the information handling system.

14. The method of claim 13 further comprising: detecting a full battery charge at the keyboard; and in response to the detecting the full battery charge, de-authorizing application of power at the charging contact with the embedded controller.

15. The method of claim 10 further comprising: in response to the detecting, coordinating a charge from the information handling system to the keyboard through wireless communication.

16. The method of claim 15 further comprising: determining a battery charge at the information handling system of less than a predetermined amount; and in response to the determining, charging the keyboard only if a keyboard battery charge is less than a predetermined amount.

17. A keyboard charging system comprising: a keyboard having plural keys to accept end user inputs and a charging port; and a hinge integrating a charging extension aligned to couple with the charging port when the hinge rotates to a closed position, the charging extension operable to apply a battery charging current to the charging port.

18. The keyboard charging system of claim 17 further comprising: first and second axles disposed in the hinge in a parallel orientation and configured to have a variable distance between each other; and first and second covers disposed over the first and second axles and configured to slide relative to each other as the first and second axles vary distance between each other; wherein the charging extension extends out of an opening formed in the first cover when the first and second axles move apart from each other.

19. The keyboard charging system of claim 18 wherein the charging extension comprises a spring biased out of an interior of the hinge.

20. The keyboard charging system of claim 19 wherein the charging extension presses into the interior when the first and second axles move closer to each other, the first and second covers coordinating to close the opening.